StorCase Technology FC-to-SCSI Single & Dual RAID - Manual (Page 163)

150 Appendix C - Troubleshooting
StorCase Technology, Inc. FC-SCSI Dual RAID Module User's Guide - Rev. A01
If the drives in an array are not equal in size, the array capacity in a RAID 5 array is based
on the smallest member's capacity. The backoff percentage is then backed off the capacity
from that amount.
In a dual controller configuration (Active-Active or Active-Passive mode), a change to this
setting on either controller is automatically updated on the other controller.
NOTE: A backoff percent of 1% is strongly recommended.
To change the backoff percentage:
1. Select Configuration Menu from the System Menu and press Enter.
The Configuration Menu should now display (Figure 31).
2. Select Backoff Percent and press Enter.
The Backoff Percent screen should now display.
3. Enter the desired backoff percent and press Enter.
The percentage is entered as a 3-digit number, using the following format - 00.0%
(default is 01.0%).
Device SCSI Channel Problems
•
Not all drives connected to the device channels are displayed during boot, or the
RAID Controller Module hangs during display of connected drives and never
reaches the Administrator Utility screen.
Check the InfoStation to make sure it is properly configured for use with the RAID Controller
Module . Check to make sure all the InfoStation drive carriers are properly installed. Check
termination and ID assignment. Or, try reducing the maximum drive channel speed. If there
are drives that are not Ultra160 capable, try setting the bus speed to 80MB/sec.
NOTES: Check the controller termination settings for all channels.